Support, but warn, about top level language custom params

Updates #10947

common/maps/params.go

@@ -70,7 +70,7 @@ func (p Params) IsZero() bool {
 	}
 
 	for k := range p {
-		return k == mergeStrategyKey
+		return k == MergeStrategyKey
 	}
 
 	return false
@@ -103,7 +103,7 @@ func (p Params) merge(ps ParamsMergeStrategy, pp Params) {
 
 	for k, v := range pp {
 
-		if k == mergeStrategyKey {
+		if k == MergeStrategyKey {
 			continue
 		}
 		vv, found := p[k]
@@ -124,7 +124,7 @@ func (p Params) merge(ps ParamsMergeStrategy, pp Params) {
 
 // For internal use.
 func (p Params) GetMergeStrategy() (ParamsMergeStrategy, bool) {
-	if v, found := p[mergeStrategyKey]; found {
+	if v, found := p[MergeStrategyKey]; found {
 		if s, ok := v.(ParamsMergeStrategy); ok {
 			return s, true
 		}
@@ -134,8 +134,8 @@ func (p Params) GetMergeStrategy() (ParamsMergeStrategy, bool) {
 
 // For internal use.
 func (p Params) DeleteMergeStrategy() bool {
-	if _, found := p[mergeStrategyKey]; found {
-		delete(p, mergeStrategyKey)
+	if _, found := p[MergeStrategyKey]; found {
+		delete(p, MergeStrategyKey)
 		return true
 	}
 	return false
@@ -148,7 +148,7 @@ func (p Params) SetMergeStrategy(s ParamsMergeStrategy) {
 	default:
 		panic(fmt.Sprintf("invalid merge strategy %q", s))
 	}
-	p[mergeStrategyKey] = s
+	p[MergeStrategyKey] = s
 }
 
 func getNested(m map[string]any, indices []string) (any, string, map[string]any) {
@@ -242,7 +242,7 @@ const (
 	// Add new keys, merge existing.
 	ParamsMergeStrategyDeep ParamsMergeStrategy = "deep"
 
-	mergeStrategyKey = "_merge"
+	MergeStrategyKey = "_merge"
 )
 
 // CleanConfigStringMapString removes any processing instructions from m,
@@ -251,13 +251,13 @@ func CleanConfigStringMapString(m map[string]string) map[string]string {
 	if m == nil || len(m) == 0 {
 		return m
 	}
-	if _, found := m[mergeStrategyKey]; !found {
+	if _, found := m[MergeStrategyKey]; !found {
 		return m
 	}
 	// Create a new map and copy all the keys except the merge strategy key.
 	m2 := make(map[string]string, len(m)-1)
 	for k, v := range m {
-		if k != mergeStrategyKey {
+		if k != MergeStrategyKey {
 			m2[k] = v
 		}
 	}
@@ -270,13 +270,13 @@ func CleanConfigStringMap(m map[string]any) map[string]any {
 	if m == nil || len(m) == 0 {
 		return m
 	}
-	if _, found := m[mergeStrategyKey]; !found {
+	if _, found := m[MergeStrategyKey]; !found {
 		return m
 	}
 	// Create a new map and copy all the keys except the merge strategy key.
 	m2 := make(map[string]any, len(m)-1)
 	for k, v := range m {
-		if k != mergeStrategyKey {
+		if k != MergeStrategyKey {
 			m2[k] = v
 		}
 		switch v2 := v.(type) {
@@ -313,7 +313,7 @@ func PrepareParams(m Params) {
 	for k, v := range m {
 		var retyped bool
 		lKey := strings.ToLower(k)
-		if lKey == mergeStrategyKey {
+		if lKey == MergeStrategyKey {
 			v = toMergeStrategy(v)
 			retyped = true
 		} else {

common/maps/params_test.go

@@ -75,7 +75,7 @@ func TestParamsSetAndMerge(t *testing.T) {
 
 	createParamsPair := func() (Params, Params) {
 		p1 := Params{"a": "av", "c": "cv", "nested": Params{"al2": "al2v", "cl2": "cl2v"}}
-		p2 := Params{"b": "bv", "a": "abv", "nested": Params{"bl2": "bl2v", "al2": "al2bv"}, mergeStrategyKey: ParamsMergeStrategyDeep}
+		p2 := Params{"b": "bv", "a": "abv", "nested": Params{"bl2": "bl2v", "al2": "al2bv"}, MergeStrategyKey: ParamsMergeStrategyDeep}
 		return p1, p2
 	}
 
@@ -92,7 +92,7 @@ func TestParamsSetAndMerge(t *testing.T) {
 			"bl2": "bl2v",
 		},
 		"b":              "bv",
-		mergeStrategyKey: ParamsMergeStrategyDeep,
+		MergeStrategyKey: ParamsMergeStrategyDeep,
 	})
 
 	p1, p2 = createParamsPair()

config/allconfig/allconfig.go

@@ -63,6 +63,31 @@ type InternalConfig struct {
 	LiveReloadPort    int
 }
 
+// All non-params config keys for language.
+var configLanguageKeys map[string]bool
+
+func init() {
+	skip := map[string]bool{
+		"internal":   true,
+		"c":          true,
+		"rootconfig": true,
+	}
+	configLanguageKeys = make(map[string]bool)
+	addKeys := func(v reflect.Value) {
+		for i := 0; i < v.NumField(); i++ {
+			name := strings.ToLower(v.Type().Field(i).Name)
+			if skip[name] {
+				continue
+			}
+			configLanguageKeys[name] = true
+		}
+	}
+	addKeys(reflect.ValueOf(Config{}))
+	addKeys(reflect.ValueOf(RootConfig{}))
+	addKeys(reflect.ValueOf(config.CommonDirs{}))
+	addKeys(reflect.ValueOf(langs.LanguageConfig{}))
+}
+
 type Config struct {
 	// For internal use only.
 	Internal InternalConfig `mapstructure:"-" json:"-"`
@@ -328,7 +353,7 @@ type ConfigCompiled struct {
 	Clock             time.Time
 
 	// This is set to the last transient error found during config compilation.
-	// With themes/modules we compule the configuration in multiple passes, and
+	// With themes/modules we compute the configuration in multiple passes, and
 	// errors with missing output format definitions may resolve itself.
 	transientErr error
 }
@@ -659,7 +684,30 @@ func FromLoadConfigResult(fs afero.Fs, res config.LoadConfigResult) (*Configs, e
 		var differentRootKeys []string
 		switch x := v.(type) {
 		case maps.Params:
+			var params maps.Params
+			pv, found := x["params"]
+			if found {
+				params = pv.(maps.Params)
+			} else {
+				params = maps.Params{
+					maps.MergeStrategyKey: maps.ParamsMergeStrategyDeep,
+				}
+				x["params"] = params
+			}
+
 			for kk, vv := range x {
+				if kk == "_merge" {
+					continue
+				}
+				if kk != maps.MergeStrategyKey && !configLanguageKeys[kk] {
+					// This should have been placed below params.
+					// We accidently allowed it in the past, so we need to support it a little longer,
+					// But log a warning.
+					if _, found := params[kk]; !found {
+						helpers.Deprecated(fmt.Sprintf("config: languages.%s.%s: custom params on the language top level", k, kk), fmt.Sprintf("Put the value below [languages.%s.params]. See See https://gohugo.io/content-management/multilingual/#changes-in-hugo-01120", k), false)
+						params[kk] = vv
+					}
+				}
 				if kk == "baseurl" {
 					// baseURL configure don the language level is a multihost setup.
 					isMultiHost = true

hugolib/config_test.go

@@ -778,6 +778,43 @@ Home.
 
 }
 
+func TestConfigParamSetOnLanguageLevel(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ["taxonomy", "term", "RSS", "sitemap", "robotsTXT"]
+[languages]
+[languages.en]
+title = "English Title"
+thisIsAParam = "thisIsAParamValue"
+[languages.en.params]
+myparam = "enParamValue"
+[languages.sv]
+title = "Svensk Title"
+[languages.sv.params]
+myparam = "svParamValue"
+-- layouts/index.html --
+MyParam: {{ site.Params.myparam }}
+ThisIsAParam: {{ site.Params.thisIsAParam }}
+
+
+`
+
+	b, err := NewIntegrationTestBuilder(
+		IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+		},
+	).BuildE()
+
+	b.Assert(err, qt.IsNil)
+	b.AssertFileContent("public/index.html", `		
+MyParam: enParamValue
+ThisIsAParam: thisIsAParamValue	
+`)
+}
+
 func TestReproCommentsIn10947(t *testing.T) {
 	t.Parallel()
 
@@ -817,7 +854,9 @@ title: "My Swedish Section"
 		},
 	).Build()
 
+	{
 		b.Assert(b.H.Log.LogCounters().WarnCounter.Count(), qt.Equals, uint64(2))
+	}
 	b.AssertFileContent("public/index.html", `
 AllPages: 4|
 Sections: true|